2014A&A...569A..49C

Query : 2014A&A...569A..49C

2014A&A...569A..49C - Astronomy and Astrophysics, volume 569A49-49 (2014/9-1)

Confirmation of a galaxy cluster hidden behind the Galactic bulge using the VVV survey.

COLDWELL G., ALONSO S., DUPLANCIC F., HEMPEL M., IVANOV V.D. and MINNITI D.

Abstract (from CDS):

Suzaku and Chandra X-ray observations detected a new cluster of galaxies, Suzaku J1759-3450, at a redshift z=0.13. It is located behind the Milky Way, and the high Galactic dust extinction renders it nearly invisible at optical wavelengths. We attempt here to confirm the galaxy cluster with near-infrared imaging observations and to characterize its central member galaxies. Images from the VVV survey were used to detect candidate member galaxies of Suzaku J1759-3450 within the central region of the cluster up to 350kpc from the X-ray peak emission. Color-magnitude diagrams, color-color diagrams, and morphology criteria allowed us to select the galaxies among the numerous foreground sources. Fifteen candidate cluster members were found very close to a modeled red-sequence at the redshift of the cluster. Five members are extremely bright, and one is possibly a cD galaxy. The asymmetry in the spatial distribution of the galaxies with respect to the X-ray peak emission is an indicator that this cluster is still suffering a virialization process. Our investigation of Suzaku J1759-3450 demonstrates the potential of the VVV survey to study the hidden population of galaxies in the zone of avoidance.

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Journal keyword(s): surveys - Galaxy: bulge - galaxies: clusters: individual: Suzaku J1759-3450

Nomenclature: Table 2: [CAD2014] NN (Nos 1-15).

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ACO 3158 ClG 03 43 07.5 -53 38 09           ~ 327 0
2 ACO 576 ClG 07 21 24.1 +55 44 20           ~ 312 1
3 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
4 ACO 2256 ClG 17 03 37.5 +78 37 23           ~ 928 1
5 ACO 2255 ClG 17 12 56.0 +64 04 06           ~ 605 0
6 [CAD2014] 9 G 17 59 05.36 -34 49 56.9           ~ 1 0
7 [CAD2014] 10 G 17 59 09.6922291344 -34 49 29.967115224           ~ 1 0
8 [CAD2014] 14 G 17 59 10.11 -34 49 49.2           ~ 1 0
9 [CAD2014] 4 G 17 59 10.97 -34 51 42.2           ~ 1 0
10 [CAD2014] 15 G 17 59 11.06 -34 49 48.5           ~ 1 0
11 [CAD2014] 2 G 17 59 12.98 -34 49 48.5           ~ 1 0
12 [CAD2014] 3 G 17 59 14.75 -34 50 19.9           ~ 1 0
13 [CAD2014] 13 G 17 59 16.07 -34 49 45.6           ~ 1 0
14 [CAD2014] 1 G 17 59 19.44 -34 50 18.7           ~ 1 0
15 [CAD2014] 5 G 17 59 22.85 -34 49 42.0           ~ 1 0
16 [CAD2014] 12 G 17 59 22.85 -34 48 56.2           ~ 1 0
17 [CAD2014] 6 G 17 59 25.9268370624 -34 48 49.754990376           ~ 1 0
18 [CAD2014] 8 G 17 59 26.33 -34 49 24.0           ~ 1 0
19 [CAD2014] 11 G 17 59 30.54 -34 49 10.0           ~ 1 0
20 [CAD2014] 7 G 17 59 31.11 -34 49 39.5           ~ 1 0
21 Suzaku J1759-3450 ClG 18 02 37.70 -34 50 14.4           ~ 8 0
22 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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